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18 April, 17:28

Which electron configuration represents the

electrons of an atom in an excited state?

(1) 2-1

(3) 2-8-7

(2) 2-7-4

(4) 2-4

+3
Answers (1)
  1. 18 April, 17:30
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    3) 2-8-7

    Explanation:

    An atom is in an excited state when it is very close to having a full octet (either it gains or loeses electrons to get a full octet). The first shell should have two electrons and the next one and the one after that should be eight. Since the third shell has 7 electrons it needs to gain one more electron to get a full octet. Therefore the answer is 3
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